Quote:
Originally Posted by Jasonft
There is a gold mine in South Africa that goes down just over two kilometers. How much faster would time be for the miners? How hard would it be to pump that much extra air down that far?
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It would be 303% of the sea-level speed, which would actually be pretty reasonable. At the bottom of the Kola borehole, it'd be 18600% the surface speed.
Another chrono-linked skerry:
There's a cave in France, about 300 meters long, accessible from the surface on both ends. Inside this cave is a portal such that going north sends you 10 years into the "future" and going south, the other way. However, in the final timeline in the series, the cave has collapsed, meaning travel from that time is only possible into the past. It went unnoticed until someone found you could walk through the cave one way but not the other.
It was discovered only a few weeks ago. It's not clear how far back the cave can take you, nor if changes in the past affect the future. All of them do appear to have strong inertia, keeping them mostly together, so someone without crosstime exposure might think that they're in a universe where paradoxes solve themselves (Harry Potter style).
In this case I'd particularly like to have the PCs be natives messing with what they think is time travel...